#10 Neoprene EPDM Bonded Sealing Washers Stainless Steel 18-8, Neo Bond, 100 Pieces, Works with Both #8 and #10 Screws (#8 & #10) Works with #8 and #10 Sized Screws Used to prevent leakage, distribute pressure of the bolt or screw. Stainless Steel 18-8 for high corrosion resistance Neoprene EPDM Bonded Sealing Washer 1/2 Inch Outer Diameter